50 BRITISH APHIDES. 



excretions, and give when numerous a sickly and 

 disgusting odour to the apple-trees. 



Where practicable, a syringing with tobacco water, 

 made by pouring four gallons of hot water upon a 

 pound of tobacco, will be found efficacious. Anointing 

 the branches with soft soap or strong soapsuds kills 

 all bark-pests, and the alkali has been said so far to 

 act on the sap passing to the leaves that it sickens 

 the Aphides, and causes them to fall and die on the 

 ground. These remedies, however, are insignificant 

 when compared with the clearing effects produced by 

 many Coccinellidce and Ichneumonidce. 



Aphis mall must not be confounded with the pest 

 known as the American blight, which also is an apple 

 Aphis, but belongs to quite another tribe and genus, 

 afterwards to be described. 



Aphis urticaria, Kalt. Plate LI, figs. 1—4. 

 Kalt., Walk., Koch. 



Apterous viviparous female. 



Body oval or globular, domed, dark green, mottled 

 with pale green patches. Eyes brown. Antennse pale, 

 much shorter than the body. Nectaries pale yellowish, 

 straight, slightly dilated at their bases. Tail broad, 

 about half the length of the nectary, j)ilose. Legs 

 short, pale ochreous, hirsute. Rostrum with a brown 

 tip, reaching to the second cox^e. 



Pupa. 



Coloured much as the larva, but the head is broader 

 and the legs are paler. Tarsi dark. Wing-cases 

 olive green. 



